He works in China now ,but he __ in Africa for eight years.(worked/had worked)请问后面括号里面应选哪一个?为什么?

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• He works in China now ,but he __ in Africa for eight years.(worked/had worked)请问后面括号里面应选哪一个?为什么?
• He works in China now ,but he __ in Africa for eight years.(worked/had worked)
• I start working at this company when I left school这句话有什么语法错误,怎么改?如果不去掉"when"要怎么修改,
• 提一些英语问题It's twenty years he came to work in this school.A.that B.since 答案是B,为什没不选A?Stephen Hawking stressed to the interviews that his accomplishments would certainty have been achieved by others, A.never had he lived B.had he never lived C.he had never lived D.never had he lived为什么选B?这句话又如何翻译?Little i known when i took the trip where it could lead me.为什么用did不用had?He did not teach himself to paint he was in his twenties.这是一道填词题,我写的是before,答案是until ,不